Microwave makes a grinding or scraping noise when the turntable rotates.

Safety first: Unplug the microwave before handling the tray.

Steps to eliminate grinding noise:

• 1. Remove tray and ring: Take out the glass tray and roller ring. Inspect for chips, cracks, or flat spots on the rollers.
• 2. Clean thoroughly: Wipe the cavity floor and the groove where the roller ring sits. Remove any crumbs or hardened spills.
• 3. Inspect coupler: Check the plastic coupler for wear or deformation that could cause wobbling.
• 4. Test without load: Run the microwave for a few seconds with only the coupler installed (no tray or ring) to see if the noise persists. If quiet, the issue is with the tray or ring.
• 5. Replace damaged parts: Replace the roller ring or glass tray if they are visibly damaged.